Automatic magnetic circuit-breaker.



Tin- 894,910. FATHER-Emmi, 1-908.

W. M. SCOTT." AUTOMATIC MAGNETIG CIRCUIT BREAKER. APPLICATION FILED MAY 28,1904. RENEWED MAR. 26, 19M. I

2 SHEETS-SHEET}.

INVENITOR: j MLUMIMJCOZZ NE'SSESF;

No. 894,910. I PATENTED AUG. 4, 1908.

" W. M. SCOTT. AUTOMATIC MAGNETIC CIRCUIT BREAKER.

APPLICATION FILED MAY 28,1904. RENEWED MAR. 26, 1907.

2 SHEBTS SHEBT 2.

WITNESSES: A INVENTOR:

WILLIAM M. SCOTT, OF PHILA-DELPHIA, PENNSYLVANIA.

AUTOMATIC MAGNETIC CIRGUIT-BREAI'IER. I

Specification of Letters Patent.

Patented Aug. 4, 1908.

Application filed May 28, 1904, Serial No. 210,303. Renewed March 26, 1907. Serial No. 364,658.

To all whom it may concern:

Be it known that I, WILLIAM M. Scent, of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Imrovements in Automatic Magnetic Circuitreakers, whereof the following is a specification, reference being had to the accompanying drawings.

My improvements are particularly applicable to circuit breakers comprising a ivotally supported bridge which is norma ly in cluded in an electric circuit and provided with normally detained actuating mechanism which upon increase of the current to a predetermined limit, will be automatically triptped 0 break the circuit by removing said bru ge. As each operation necessitates that 'the bridge be manually restored to its original closed osition, considerable time and labor is ordinarily required to maintain such a device in proper relation to the circuit.

Therefore, it is the object of my invention to provide a device the character specified which while having such delicacy of adj ustment as to enable it to respond to slight variations in the current, yet comprises means to retard the releasing operation to a degree sufficient to prevent the unnecessary operation of the device by momentary fluctuation in the current.

My invention also comprehends the provision of means to adjustably predetermine the extent of such retardation.

The form of my invention hereinafter described comprises a retarding device of the dash pot type, comprising a plunger arranged to displace a body of liquid. Said plunger is normally connected by a dctaclnible clutch, with the movable core of a magnet coil by which the breaking operation is initiated. The arrangenuvnt is such that said core may idly rocipromrto in accordance with limited fluctuations in the current, without breaking the circuit; the breaking limit of its movement being determined by the adjustment of an abutment which when encountered by the clutch releases the latter and thus frees said core from the retarding device.

The form of my invention hereimil'ter described also comprises a weight bar connectcd to said core, and having an adjustable weight whereby the variable operation of the device is facilitated.

My invention comprises the various novel features of construction and arrangement hereinafter more definitely specified.

In the accompanying drawings, Figure I, is a front elevation of an instrument conveniently embodying my in'iprovements. Fig. ll,1s an elevation of the right hand side of said instrument shown in Fig. l a portion of the dash pot being broken away to disclose its interior construction. Fig. III, is

a fragmentary sectional view taken on the linelll, III, in Fig. II, showing the details of construction of the adjustable abutment.

In said figures,1, is the base, of insulating material, provided with rear connections 2, and 3, for the line circuit, and having the .opposed terminals 5, and 6, secured in sta tionary position on said base 1', and, comprising the resiliently supported carbon contact plates 7, and 8, for engagement with the bridge 10. The britge 10, normally connects said terminals 5, and 6, as shown in Fig. I; and, the magnet coil 11, by which the automatic tripping action is effected, is included in the circuit between said terminal 6, and the connection 3, for' the line. Said bridge 10, is provided with spring pressed carbon contact plates 12, and 13 to respectively engage the contact plates 7 and 8, and is supported by the lever 14, provided with the operating handle 15. Said. lever 14,'is pivoted on the pin 17, in the frame 118", which is secured in stationary relation with said base 1. Said lever 14, is provided with the hook 20, arranged to operatively engagethe detent lever 21, which latter is pivoted on the pin 22, in said frame lti, and'provided with the spring 24, which tends to press it into engagemei'it with said hook 20. -Thc arm 26, of said detent lever 21, overhangs the tripping pin 27, which ismountcd to reciprocate in the stationary core 29, in coin-entric relation with the coil 1]. The lower extremity of said core 29, is provided with a conical socket 230, in which the end of said pin 27, normally depends. The movable core 32,

extends in axial alincment with said coilll,

and pin 27, through the lower portion of the frame 18, and is pivoted below the latter to the weight bar 34, which is pivotal y. Sl1spended by the link 35, from. the l'ramc18. Said weight bar 34, is provided with the weight 36, having the index point 37, and is adjustable from end to end of the slot 38, in which it is secured in adjusted osition by the screw 40, which is convenient y provided with the milled head 41. Accidental rotary displacement of said core 32, is prevented by its pivot pin 43, which projects through the J 50, in the nppcr may be :ci

Vertical guide pinto 146, which is mountod upon tho lop oit tho casing 48, as shown in F1 Said pin 43, ailv the lower extremity arranged to engage the which is pivotcd on tho pin 1nd ol' the (lush pot plunger of said lever 49, cxlcnds out S l, which is adjust Of said corc L2, is clutch lever 49 51, and tho :1, boni'ruth. the. u

:iblo vcrticiilly 1n tic housing to lhc exl i A 1 1 ton l1 ol the slotbl), lihcr 1. mud abut ii in any the bolt rod positiono S, and nut 53), )osl v Sui plung r 51, is pro- 1' i iity -with mounted to rocir, ova/to in 652, which nornuilly mainoum'y position. in tho cl'iiimbcr j Said chain? cr contziinvi liquid 65, Wl 'ch is p imii ily inihrouch thc opening lib, cl cd by the carp and, tho arrangement 1:5 suco. that l liruuc uisplzicod through the narrow .ur lhr bolloni cl lh cylinder 62 by of which is con- Jrdod. l4 o curl-c1 nil;

(cd to .l

u pr; m" l arm 2;}, cl llLt-lli from the brn l(), to be 3111 lbo tonmi! 5, and (3. the idlc mo /w mcin oi E'lZllLl cor Wllllli mm" occur willioul cli'crmy; tho ltlllililllllfl breaking cumzition ziioorc dcscribcd, nnry of coma-w bo varied in ILCUOl'llliiICP \inh thc position ol Uh nisl'inciit o'l lhc abutment 54; and, lhc

iluctiuilion in lhc to rllHct tho to tho prci 3.1 'zizigemcnt the cup l l l l l l r, i l

orth as it is obvious th it various I claimz- 1. In a circuit breaker, the combination it'll a. movable bridge which is normally ineluded in the circuit of a spring tending to remove said bridge oin tho circuit; ii div-- tcnt norinzill rotziinmg said bridgc in tho circuit; a magnet coil included in tho circui provided wi 0 zirrziugod to To co said (l(" )lll'- current rises to :L prcdctr nincd dug EL retarding device; it clutch. nornuili l, :tly connccting said rcl zu'ding; maric with. said core; and, 21.11 sulubic abutment independent of said core :irrziru Al to rclcaso said clutch when sand coro is shiil'cd to 22 predetermined point, substain liully mi forth.

2. in it circuit brozikor, the combination with a. movable bridge, which is normally in- :(l in thc circuit; of :i (lclcnt normally .l uning said bridge in tho circuit' u magnet coil included in tho circuit and provided with iriovnblc coro arranged to rclcuso 1'' id dctcn'r ion the. current l'la to u, orcdctcrmined dcgrec; a, rolvzu'din :ico; a. clutch norn'izilly directly coru'u :iiid rctzirdii'ig dcvico with said corc; dud, an :uljuslublc 1 supported n.lcpcndcntly of, but op- ,i ,rivsiy crmncctcd will] and core, cubstzuu tisill m sol. l'orth.

Lil. l ii circuit brcnlror, tho combination with n ringflrulil bridge which is nornnilly inciudcd in tho (211' I ol :1. spring tcnding to rcmovc mid l)l'l1l{, f(! irom tho circuit; {L dclont ll v -.l :.iiniii;; said bridgc in tho circuit; t coil incl udod in lhc circuit mid prowith n. ,n'uimlilc corc arranged to rcloam, lurid dolcut when tho current l'iscs to it pr lcliormincd dcg'rcc; 2L- rctsirding dcvic; it c normnll directly connoctmg mid rclu dcvico 'Wlll sz'ud corc; nmzins :ir-

rmi gcu 'l clutch whcn mid corc lo "clmisc r.

is chilled to n. prcdclormincd point; 21, .rcight lcvor ('ormcclod with said corc; and :LH :ul- 1 right on HEB-Ml lovcr, substantially mam-l '2' in; auto tic magnclic circuit tho combumlirm. with {LU insulating .i' u. l'rzisno mountcd on Rind busc; cir- "muuils mountcd on smd lmsc; n nuignot coil included in tlic circuit; ll bridgc l'or suid 'l'icrminals pivotnlly v\upporlcd in said 139 frumc; 2i dist ht :irrzingcd lo norm idly rctrtin .szii l bridgo in contzi ;t with said tcrminzils; :1. ripping pin mounted to reciprocate in. said coil? zirrung'cd to rolciso sziii'l dotont; it movziblc ccrc for said coil, in opcrzitivo rcliition th quid tripping pin;

7 2L casing supported by said bnsc pliito, comprising ii clnunbor; t .rctzirdingg liquid in mid cliirml :i plungor armijigcd. to casing :Lflll dispiocc' see-sic lunger, arranged to normally directly enage said core; and, means arranged to recase said. clutch when said core is shifted to -predetermiued point, substantially as set rt es sv as '"d 5. In an automatic magnetic circuit breaker, the combination with an insulating base; of a frame mounted on said base; circuit terminals mounted on said base; a magnet coil mounted on,said base and included in the circuit; a bridge for said terminals; a lever supporting said bridge, provided with an operating handle and pivoted in said. frame; a hook on said lever; a pair of spring buffer plates arranged on said. frame to receive said handle lever when the circuit is broken; a detent lever arranged to engage said hook and normally retain said bridge in contact with said terminals; a spring tending to thrust said detent lever into engagement with said hook a tripping pin concern, trically disposed in said coil, arranged to re lease said detent lever; a movable core for said coil, in operative relation with said tripping pin; a weight bar pivotally connected to said frame and to said core; a weight carried by said bar; means to secure said weight in different positions; a casing supported by said base plate, comprising a chamber; a retarding liquid in said chamber; a cylinder mounted in said casing in communication 'ith said chamber; a plunger arranged to reciprocate in said cylinder; a clutch lever carried by said plunger, arranged to normally directly engage said core; an adjust-- able abutment arranged to release said clutch lever; and, means arranged to secure said abutment in adjusted position, substantially as set forth.

6. in an electrical switch, tripping mech anism comprising a restraining latch, 21 core or armature member for actuating said latch, a dash pot plunger, a clutch carried by said plunger and connecting the same directly to said core or armature member, and means for disconnecting said plunger from said member after predetermined extent of travel.

7. ln electrical switch, tripping mechanisin comprising a latch, a core or arn-iature member for actuating said latch, awlash. pot l plunger, a clutch pivoted thereon and norl mally locking the same directly to said core I or armature member, and. means for releasing said member from said plunger after prcdetermined travel. i

8. In an electrical switch, tripping mcchanism comprising a latch, a core or armature member foractuating said latch, .a dashpot 1 plunger, a clutch for normally connecting said dash pot plunger directly with said core or armature member to retard the same, and an adjustable abutment for actuating said clutch to release said core or armature memher after predetermined travel.

9. In an electrical switel'i, tripping meelr anisin comprising a latch, a solenoid core for actuating said latch, a dash pot plunger, a clutch carried by said plunger and normally directly engaging said core to retard the same, and an abutment engaged by said clutch after predetermined travel to release said core.

l0. ln an electrical switch, tripping mechanism. comprising a latch, a solenoid core for actuating the same, a dash pot plunger in substantially axial alinement with said core, a clutch normally locking said plui'iger to said core, and means for releasing said core from said plunger after predetermined travel.

11. In an electrical switch, tripping mechanism comprising a latch, a core or armature member for actuating the same, a reciprocating dash pot plunger, a clutch for locking said plunger directly to said core or armature member to retard the same, and an abutment engaged by said clutch after predeten mined n'ujivemcnt to release said member.

12. in. an electrical switch, tripping mechanism comprising a latch, solenoid core for actuating said latch, and a dash pot plunger latched directly to said core for retz/ rug the same.

13. In an electr calswitch, separable cooperative contacts, a latch for restraining said contacts in normal position, a solenoid core for actuating said latch, a retarding device comprising a movable member, a latch directly connecting said. movable member to said core for retarding said core, said core and member latched thereto being disposed beneath said contacts. 1%. ln an electrical switch, separable cooperative contacts, a latch for restraining said contacts in normal position, a solenoid core for actuating said latch, a dash pot plunger latched directly to said core for re- 1 tarding the same, said core and plunger being disposed beneath said contacts and in aline meut with each other. v i

l u testinmuy whereof, l have hereunto signed my name at Philadelphia, Pennsylvania, this 25th day of May, 1904,

7 WM. M. SCOTT.

Ni tnesscs:

ARTHUR E. PAIGE, JAMES ll] BELL. 

